<template>
  <div class="wrapper">
    <v-head></v-head>
    <v-sidebar></v-sidebar>
    <div class="content-box" :class="{ 'content-collapse': collapse }">
      <div class="content">
        <transition name="move" mode="out-in">
          <keep-alive :include="tagsList">
            <router-view></router-view>
          </keep-alive>
        </transition>
        <el-backtop target=".content"></el-backtop>
      </div>
    </div>
  </div>
</template>

<script>
import vHead from "../components/Hearder.vue";
import vSidebar from "../components/HelloWorld.vue";
import bus from "./bus";
export default {
  data() {
    return {
      tagsList: [],
      collapse: true,
    };
  },
  components: {
    vHead,
    vSidebar,
  },
  created() {
    bus.$on("collapse-content", (msg) => {
      this.collapse = msg;
    });

    // 只有在标签页列表里的页面才使用keep-alive，即关闭标签之后就不保存到内存中了。
    bus.$on("tags", (msg) => {
      let arr = [];
      for (let i = 0, len = msg.length; i < len; i++) {
        msg[i].name && arr.push(msg[i].name);
      }
      this.tagsList = arr;
    });
  },
};
</script>
<style lang="scss">
.content-collapse {
  left: 65px;
}
.content-box {
  position: absolute;
  left: 250px;
  right: 0;
  top: 70px;
  bottom: 0;
  padding-bottom: 30px;
  -webkit-transition: left 0.3s ease-in-out;
  transition: left 0.3s ease-in-out;
  background: #f0f0f0;
  .content {
    width: auto;
    height: 100%;
    padding: 10px;
    overflow-y: scroll;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
  }
}
</style>
